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ATmega324P Datasheet(PDF) 299 Page - ATMEL Corporation |
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ATmega324P Datasheet(HTML) 299 Page - ATMEL Corporation |
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299 / 377 page  299 7674F–AVR–09/09 ATmega164P/324P/644P 25.2.1 Latching of Fuses The fuse values are latched when the device enters programming mode and changes of the fuse values will have no effect until the part leaves Programming mode. This does not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on Power-up in Normal mode. 25.3 Signature Bytes All Atmel microcontrollers have a three-byte signature code which identifies the device. This code can be read in both serial and parallel mode, also when the device is locked. The three bytes reside in a separate address space. For the ATmega164P/324P/644P the signature bytes are given in Table 25-6. 25.4 Calibration Byte The ATmega164P/324P/644P has a byte calibration value for the internal RC Oscillator. This byte resides in the high byte of address 0x000 in the signature address space. During reset, this byte is automatically written into the OSCCAL Register to ensure correct frequency of the cali- brated RC Oscillator. 25.5 Page Size Table 25-6. Device and JTAG ID Part Signature Bytes Address JTAG 0x000 0x001 0x002 Part Number Manufacture ID ATmega164P 0x1E 0x94 0x0A 940A 0x1F ATmega324P 0x1E 0x95 0x08 9508 0x1F ATmega644P 0x1E 0x96 0x0A 960A 0x1F Table 25-7. No. of Words in a Page and No. of Pages in the Flash Device Flash Size Page Size PCWORD No. of Pages PCPAGE PCMSB ATmega164P 8K words (16 Kbytes) 64 words PC[5:0] 128 PC[12:6] 12 ATmega324P 16K words (32 Kbytes) 64 words PC[5:0] 256 PC[13:6] 13 ATmega644P 32K words (64 Kbytes) 128 words PC[6:0] 256 PC[14:7] 14 Table 25-8. No. of Words in a Page and No. of Pages in the EEPROM Device EEPROM Size Page Size PCWORD No. of Pages PCPAGE EEAMSB ATmega164P 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8 ATmega324P 1 Kbytes 4 bytes EEA[1:0] 256 EEA[9:2] 9 ATmega644P 2 Kbytes 8 bytes EEA[2:0] 256 EEA[10:3] 10 |
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